The seller of mine said they were off a Chevy car, Fleetline, 6 volt. The stamping is 643 low tone and 644 high tone, with single terminal. darn near sounds like a Semi on 12 volt system.
54 Chevy 3100 Deluxe 3 speed on column. Keeping original as possible but changed to 12 volt system. JB Weld..."I put that stuff on everything"
